package com.gjt;

import java.util.Arrays;

/**
 * Hello world!
 *
 */
public class App 
{

    public static void main( String[] args ) {

    }



     class TreeNode {
        int val = 0;
        TreeNode left = null;
        TreeNode right = null;

        public TreeNode(int val) {
            this.val = val;

        }
    }
}